tree 51a03df748cdd0fc0e3c9fa8e02e62a3ffa59db5
parent 1a3f9edc08e527953eff5a1a3a500ddd1e429807
author Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com> 1590142356 +0200
committer Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com> 1591600160 +0200

Implement use of internal DRBG for ecp_mul()

The case of MBEDTLS_ECP_RESTARTABLE isn't handled correctly yet: in that case
the DRBG instance should persist when resuming the operation. This will be
addressed in the next commit.

When both CTR_DRBG and HMAC_DRBG are available, CTR_DRBG is preferred since
both are suitable but CTR_DRBG tends to be faster and I needed a tie-breaker.

There are currently three possible cases to test:

- NO_INTERNAL_RNG is set -> tested in test_ecp_no_internal_rng
- it's unset and CTR_DRBG is available -> tested in the default config
- it's unset and CTR_DRBG is disabled -> tested in
  test_ecp_internal_rng_no_ctr_drbg

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>